Make sure you've done the following:

• [X ] You're using the latest build for your server version
• [X ] This isn't an issue caused by another plugin
• [ X] You've checked for duplicate issues
• [X ] You didn't use /reload

Debug paste link:

[PremiumVanish] The WorldParticlesModule does not work because of a currently unfixed error in ProtocolLib's 1.13 support (NPE in WORLD_PARTICLES/packet.getNewParticles().read(0)

this report is useless.
please include:

• the protocollib version
• the spigot version
• the code that throws the exception
• the exception
• a debug paste

its the latest version of protocollibb spigot 1.13.1, the warning is posted above even if Protocollibb didn't throw any exception

get the author of premium vanish to properly report bugs, else we can't do anything here...